1. Engineering Economics

    Sales of bottled water in the U.S totaled 16.3 gallons per person in 2004. Water costs .40 cents per bottle.A municipal company provides tap water for $2.10 per 1000 gallons. If the average person drinks two bottles of water per day or uses 5 gallons per
  2. Physics 11

    The speed of water waves is 30cm/s in deep water & 15cm/s in shallow water. If the wavelength in deep water is 1.0cm, what is the wavelength in shallow water? (v2/v1)=(wavelength2/wavelength1) Therefore (15/30)=(wavelength2/1) - 15=30wavlength2
  3. Chemistry

    A compressed air tank carried by scuba divers has a volume of 9.5 L and a pressure of 140 atm at 20∘C. If the gas was instead in a cylinder with a floating, massless, frictionless piston, what would the volume of the gas be (in liters) at STP? Express
  4. English

    This topic is deleting satistical data and examples. original material Water is an important part of the earth.In fact, water is the reason human beings live on the planet.Water is everywhere.It is in the atmosphere, the air that people breathe. it is in
  5. chemistry - enthalpy change and finiding volume of

    29. Consider the following chemical equations and their enthalpy changes. CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) ΔH = −8.0 × 102 kJ CaO(s) + H2O(_) → Ca(OH)2(aq) ΔH = −65 kJ What volume of methane, at 20°C and 100 kPa, would have to be combusted in
  6. maths

    ajana and maya went for picnic.their mother gave them a water bottle that contain 4 litre water. maya consumed 3/4 of water and ajana consumed the remaining water. how much water maya drink? and what fraction of total quantity of water anjana drink?
  7. chemsitry

    You have been provided 100mL of a 1000ug/ml barium standard what volume of this standard must be diluted into 50mL of ID water to produce a 30 ug/ml standard ? if you given a full 100mL of the same standard provied calculate the amount of standard and
  8. Chem

    Consider a glass of 277 mL of water at 25°C. Calculate the mass of ice at -15°C that must be added to cool the water to 10°C after thermal equilibrium is achieved. To find the mass of water use the density of water = 1.0 g/mL. I have no idea how to
  9. Chemistry

    At 20 degrees C ethanol has a density of 0.789 g/ml and H2O has a density of 1.0 g/ml. What is the % by volume of ethanol of a solution made by adding 50g of ethanol with 50g of H2O? Tutor Answer: Use density = mass x volume to convert 50 g ethanol to
  10. AP Chem

    Hey guys! Thanks for any help in advance! I'm back with this problem: Calculate the percent dissociation for a 1.00 × 10-6 M solution of HCN at 25 °C. Ka = 4.90 × 10-10. So my question really is do I have to use water when I calculate the percent
  11. Physical science

    Help Please . Aisha drops an antacid tablet in water and times how long it takes to dissolve. Which of the following will decrease the reaction rate? A.increasing water temperature B.decreasing water temperature C.using more water
  12. Water Treatment

    Based on the treatment scheme, what type(s) of raw water is / are being treated? Groundwater River water Riverbank filtrate Lake water Infiltrated river water please post answer
  13. 3rd homework

    the water cycle! lesson I water on earth type of water 1. ? where found 2. ? 3 ? 4 ? uses 5. ? 6. ? 7. ? 8. ? where found 9. ? 10. ? 11. ? uses 12. ? 13. ? 14. ? 15. where salt and fresh water meet is called an ? please help with the ?'s. I have no idea
  14. Chemistry

    A portable electric water heater transfers 255 watts (W) of power to 5.5 L of water, where 1 W = 1 J/s. How much time (in minutes) will it take for the water heater to heat the 5.5 L of water from 25 degrees celsius to 42 degrees celsius? (Assume that the
  15. Math

    The volume V of gas varies inversely as the pressure P on it. If the volume is 240 cm^3 under pressure of 30 kg/cm^2, what pressure has to be applied to have a volume of 160 cm^3 ?
  16. Calculus

    Show that a right-circular cylinder of greatest volume that can be inscribed in a right-circular cone that has a volume that is 4/9 the volume of the cone. Please, help out, this is for a study guide for a quiz. :) Thank you.
  17. Chemistry

    A quantity of 1.435g of naphthalene (C1oHs), a pungent-smelling substance used in moth repellents, was burned in a bomb calorimeter (constant volume). Consequently, the temperature of the water rose from 20.17°C to 25.84°C. If the mass of the water
  18. physics 1401!

    A closed-end tube is evacuated and placed with its open end beneath the surface of a reservoir of water. The water rises to a height of 9.5 m. If the density of water is 1000 kg/m^3, what is the pressure at the bottom of the column of water?
  19. physics

    A 1.41-kg aluminum pot contains 2.25 L of water. Both pot and water are initially at 17.5°C. How much heat must flow into the pot and the water to bring their temperature up to 92.7°C? Assume that the effect of water evaporation during the heating
  20. chemistry

    When 25 mL of C2H5OH (density 0.80 g.cm-3) is dissolved in water to prepare a 250 mL solution, the density of the solution was found to be 0.950 g.cm-3. Calculate a. Molarity of pure ethanol; b. Molarity of ethanol in the final solution; c. Volume of the
  21. Chemistry

    Can someone please help me with the following? How do I find the specific heat of a metal when the only information I have is a temperature change ( of -73 degrees C) and a mass (of 22.53 grams)? And what is the forumla for specific heat? Thanks in
  22. Computers

    How does a search engine work? List the four main parts of an e-mail header.
  23. Math natural logarithms

    The efficiency e of a gasoline engine as a function of its compression ratio r is given by e =1− r^(1−γ) , where γ is a constant. Find γ for e = 0.55 and r = 7.5
  24. physical science

    inside the cylinders of a diesel engine, what helps to ignite the fuel and air?
  25. Physics

    An engine works between the two temperatures 200 C and 120 C. Calculate its efficiency in percentage?
  26. phys

    A reversible engine with an efficiency of 32.0% has TC = 304.0 K. (a) What is TH? (b) How much heat is exhausted for every 0.138 kJ of work done?
  27. physics

    How much work is needed to lift a 400kg engine upward 1.5 meters out of a car?
  28. PHYSICS

    a 1500kg sports car accelerates from 0 to 30 m/s in 8 seconds. Whaat is the power of its engine? Please help
  29. PHYSICS

    a 1500kg sports car accelerates from 0 to 30 m/s in 8 seconds. Whaat is the power of its engine?
  30. Tech Please help

    Which of the following is a search engine? A) Mozilla Firefox B)Internet Explorer C)Google*** D)Safari
  31. physics

    How much work is needed to lift a 400kg engine upward 1.5 meters out of a car?
  32. physics

    How much work is needed to lift a 400kg engine upward 1.5 meters out of a car?
  33. math

    The efficiency e of a gasoline engine as a function of its compression ratio r is given by e =1− r1−γ , where γ is a constant. Find γ for e = 0.55 and r = 7.5.
  34. Science

    How do sound waves travel between a boat and a submarine in sonar technology? A. Because of water particles. B. Because of water waves. C. Because of water ripples. D. Because of water currents. Is it A?
  35. SCIENCE HELP PLS

    Which of the following is a source of graywater? Sewage water Shower water Water waste from an auto repair garage Water waste from a chemical company is it b
  36. Science

    How do sound waves travel between a boat and a submarine in sonar technology? A. Because of water particles. B. Because of water waves. C. Because of water ripples. D. Because of water currents. B?
  37. Social studies

    Can you check my answers? 1;what was the effect of WWI on SC? A;state economy shrunk*** B;citizens used more resources C;factoryy production slowed D;women worked mens jobs 2;How did the end of WWI affect farmers in SC? A;crop prices dropped*** B;rural
  38. physics

    Bird bones have air pockets in them to reduce their weight–this also gives them an average density significantly less than that of the bones of other animals. Suppose an ornithologist weighs a bird bone in air and in water and finds its mass is 43.0 g
  39. science

    You measure the dimensions of a rectangular block of aluminum to determine its volume. It has the following dimensions. length = 10.27 cm; width = 4.92 cm; height = 1.53 cm Assuming that each of these measurements is accurate to the nearest 0.01 cm, find
  40. Science

    36kg of some material undergoes a process in a piston-cylinder apparatus starting with an initial volume of .057m^3 and pressure of 680kPa. The final volume is twice the initial. Compute the work done by the substance for the following processes: (a)
  41. Physics

    Energy Budget for a Rocket in Free Space: Recall the analysis of the rocket engine in Project I, Flight of the Rocket. Although the momentum of the rocket and its exhaust is conserved (constant), their energy is not; energy must be supplied by the
  42. Physics

    Energy Budget for a Rocket in Free Space: Recall the analysis of the rocket engine in Project I, Flight of the Rocket. Although the momentum of the rocket and its exhaust is conserved (constant), their energy is not; energy must be supplied by the
  43. Chemistry

    You dissolve 2.35 g of sodium carbonate (Na2CO3) in sufficient water to produce a final solution volume of 100.0 mL. Assuming all of the solid dissolves, calculate the solution pH.
  44. Chemistry

    What is the concentration of chloride ions (in) in a solution prepared by adding 0.075 moles of calcium chloride to 425 mL water,assuming no volume change up on mixing? Thanks!
  45. Chemistry

    2. A eudiometer contains 45 ml of oxygen when the barometer reading is 731.7 mm and the temperature is 27* C . The water level inside the tube is 68mm higher than that outside . What volume does the dry oxygen occupy at S.T.P?
  46. Chemistry 20

    What volume, in millilitres, of distilled water must be added to 105 mL of 0.600 mol/L sulfuric acid solution in order to dilute it to a concentration of 0.400 mol/L
  47. science

    Calculate the specific volume of an air-vapour mixture when the temp=30 degree Celsius, water vapour content Mw=0.015 kg/kg, total pressure Pt=90kpa Please any one can help me>
  48. Impossible chemistry

    2. A eudiometer contains 45 ml of oxygen when the barometer reading is 731.7 mm and the temperature is 27* C . The water level inside the tube is 68mm higher than that outside . What volume does the dry oxygen occupy at S.T.P?
  49. chemistry

    supposed we mixed 50.0mL of alcohol w/ enough water to make 400mL solution find the % age by volume of 50L??? what is the answer plz answer my qeustion!!!
  50. Chemistry

    Consider the following reaction: H2O(l) + 3NO2(g) --> 2HNO3(l) + NO(g) What volume of NO (in L) is produced starting from 1.80 g of water and 11.5 g of NO2 at 300 K and 1 atm? (use R = 0.0821 L atm/mol K). I am completely confused :(
  51. Chemistry 3A

    in a lab experiment, 133mL of gas was collected over water at 24 degrees Celsius and 742 torr. Calculate the volume that the dry gas would occupy at STP.
  52. chemistry

    If you dissolve 236.5 g of (NH4)3PO4 and 166.9 g of K3PO4 in enough water to make the volume of the solution 505.0 mL What is the molarity of ammonium ions and phosphate ions?
  53. chemistry

    If 987g of oxygen gas reacts completely with hydrogen gas, what volume of water vapor will be produced (in L) at 0.954 atm and 465 degree=es celcius?
  54. Pre-Calculus

    Water is spraying from a nozzle in a fountain forming a parabolic path. The nozzle is 10 cm above the service of the water. The water achieves a max height of 100 cm above the waters surface and lands in the pool. The water spray is again 10 cm above the
  55. Physics

    A high diver of mass 65.0 kg steps off a board 10.0 m above the water and falls vertical to the water, starting from rest. If her downward motion is stopped 2.30 s after her feet first touch the water, what average upward force did the water exert on her?
  56. Chem 125

    Three bulbs are connected by tubing, and the tubing is evacuated. The volume of the tubing is 27.0 mL. The first bulb has a volume of 37.0 mL and contains 5.65 atm of argon, the second bulb has a volume of 250 mL and contains 2.16 atm of neon, and the
  57. Math please help

    Please only one answer for each question. For questions 1-3, identify the situation that each graph could represent. 1. A. the length of a necklace that you make at a rate of 10 cm per hour without taking a break. B. The height of a balloon as it rises,
  58. Chemistry

    In the experiment shown below, you add some salt to water. A = All of the solid dissolves (no solid at the bottom). B = You add more water and the solid stays dissolved. Select all of the following that are true about solutions A and B. The same number of
  59. geometry

    You have looked at it two times before. There are 30 questions worth 30 points. Part 1 Multiple Choice: Select the best answer from the choices provided. (Each question is worth one point) 1. Determine how many wheels are turning clockwise. 1 2 none 2.
  60. GEOMATERY

    AN OPEN WATER TANK WITH LENGTH 20CM AND WIDTH 15CM HOLD 4.8 LITER OF WATER .CALCULATE THE HEIGHT OF WATER LEVEL IN THE TANK AND THE TOTAL SURFACE AREA OF THE CUBOID IN CONTACT WITH THE WATER
  61. Calculus - free body diagram

    A water tank has the shape of an inverted right circular cone whose base radius is equal to half its height. Water is being pumped in at 2 cubic meters per second. How fast is the water rising when the water is 3 meters deep?
  62. Phyisic

    a student wanted to investigate whether or not the temperature of the water would affect the solubility of sugar she had three glasses of water each with 200 ml of water in them one was at 10 c the second a 25c and the third one was at 40 c she found that
  63. Biology

    The water cycle is best described by which of the following statements? Water in the atmosphere must be converted to another chemical before animals can use it. The water on earth changes forms as it moves from one reservoir to another.>----- My answer As
  64. chemistry

    Question Part Points Submissions Used A swimming pool, 20.0 m ✕ 12.5 m, is filled with water to a depth of 3.85 m. If the initial temperature of the water is 18.9°C, how much heat must be added to the water to raise its temperature to 28.7°C? Assume
  65. science

    what method of separation would do the best job to separate sand and water? hint* What would happen to the water if you put the mixture of sand and water in a pan and heated it on a stove for quite a long time? What's it called when water goes into the
  66. Physics

    A solar still is used to make fresh water from salt water by evaporation. Assume that during a summer day that 1000 BTU/ft sq of solar energy falls on the surface of the salt water. Determine how many inches of water are evaporated in 30 days. Assume that
  67. Physics

    A solar still is used to make fresh water from salt water by evaporation. Assume that during a summer day that 1000 BTU/ft sq of solar energy falls on the surface of the salt water. Determine how many inches of water are evaporated in 30 days. Assume that
  68. physics

    many automobile passengers suffer neck injuries when struck by cars from behind. how does newtons law of inertia apply here?why would a headrest help guard against whip-lash
  69. physic

    An automobile is moving in an easterly direction at a velocity of 100km/hr. He sees an emergency vehicle and slows down to 60 km/hour. If it takes him 5.0 seconds to slow down, what is his acceleration?
  70. Physics

    Why do seat belts reduce the likelihood of injury in an automobile accident? Why do airbags? Express your answers in terms of the physics principles we've been learning this week?
  71. Chemistry

    Classify the following type of stoichiometry problem: How many grams of zinc must react with an excess volume of hydrochloric acid to yield 0.500 g of zinc chloride? mass-mass problem mass-volume problem volume-volume problem mole-mole problem none of the
  72. health

    where can i find information on teen driving laws in the metropolitan area [maryland, virginia, district of columbia], and i'm not allowed to use google? Arrrrggggghhhhh. You will have to see at your school if the Drivers Ed teacher has Va, Md, and DC
  73. physics.pls help

    The volume of a cylinder is defined by the formula V=pie R squared h. If initially have a cylinder with a volume of 10m cubed. Find the volume of the cylinder if the height doubles and if the height is cut in half. pls i really need help.
  74. Computer Science 40

    Please help me with this homework assignment. I tried everything and it still didn't work. The question is: Use three variables volume, radius, and height to write a program that can be use to calculate the volume of a cylinder. Formula: volume = radius x
  75. Physics

    The rain-soaked shoes of a person may explode if ground current from nearby lightning vaporizes the water. The sudden converse of water to water vapor causes a dramatic expansion that can rip apart shoes. Water has density 1000 kg/m^3 and requires 2256
  76. AP Chemistry

    Water is being electrolysed in the presence of a non-reactive electrolyte under standard conditions. If 2.5 amperes of current flows through the circuit for 13.6 minutes at 25 degrees celsius and 1 atmosphere, what volume of hydrogen gas is produced?
  77. fish tank;; deals with volume. :]

    A cylinder shaped fish talk is 40cm high and has a radius of 12cm. The tank with be layed with a decorative gravel on the bottom. The blue layer will be 2 cm high. The yellow layer will be 3 cm high. And the green layter will be 2cm high. [assume water
  78. math

    You are designing a rain gutter made from a piece of sheet metal that is 1 foot by 5 feet. The gutter is formed by turning up two sides. You want the rain gutter to have the greatest volume possible. Below is the polynomial function that represents the
  79. science

    1.why is freshwater a limited resource? a)because most water on earth is in lakes** b)because most water on earth is in clouds c)because most water on earth is in the ground d)because most water on earth is salt water
  80. Math

    The manager of a store selling tea plans to mix a more expensive tea that costs $5 per pound with a less expensive tea that costs $2 per pound to create a 140​-pound blend that will sell for $3.80 per pound. How many pounds of each type of tea are​
  81. Math

    The volume of a certain quantity of gas is inversely proportional to its pressure. If its pressure is 1000 grams per square cm, when its volume is 3m³, what will the pressure be when the gas is compressed to a volume of 2m³? (Thanks in advance in helping
  82. Chemistry

    A student determined the calorimeter constant of the calorimeter. The student added 50.00 mL of cold water to 50.00 mK of heated , distilled water in a styrofoam cup. The initial temp of the cold water was 21,00C and the hot water, 29.15C. The maximum temp
  83. Algebra

    Blending spice: Spice of life sells ground sumac for $1.35per ounce and ground thyme for $1.85 per ounce. Aman wants to make a 20 oz Zahtar seasoning blend using the two spices that sells for $1.65 per ounce. How much of each spice should Aman use? I know
  84. Chemistry Organic

    Can someone please send me a link or tell me what happens when the following reactions takes place? As in...the colour change (if any) and any other observations * Phenol in water * Phenol in excess water * Phenol in hot water * and then Phenol in hot
  85. chemistry ( chemistry lab)

    -'Gasoline engine' what are the waste products form this engine ? what element must gasoline be composed of ? -'fuel cell'what are the waste products from this cell ? what is the fuel used in the fuel cell? MY ANSWERs : - C02 , h20 and heat energy are
  86. chemistry

    in an attempt to establish the formula of an oxide of nitrogen , a known volume of the pure gas was mixed with hydrogen and passed over a catalyst at a suitable temperature. 100% conversion of the oxide to ammonia and water was shown to have taken place.
  87. chemistry

    in an attempt to establish the formula of an oxide of nitrogen , a known volume of the pure gas was mixed with hydrogen and passed over a catalyst at a suitable temperature. 100% conversion of the oxide to ammonia and water was shown to have taken place.
  88. Chemistry

    A student finds a medallion which could be made of pure platinium or silver. IN order to find out what the medallion is made of the student takes the medallion to a chemistry lab. The student measures the density of the medallion as follows. The medallion
  89. chem

    Show work 1. How many moles of oxygen will occupy a volume of 2.50 liters at 121.6 kPa and 331 K? 2. An unknown volume of chlorine gas (Cl2) is resting at 127 °C at a of pressure 152.4 kPa. If the gas weighs 191.4 g, what is the volume? 3. A 2.917 mole
  90. Chemistry

    I need someone to check these True or False questions for me please: 3. Dissolving salt in water is a physical change- F 14. Burning newspaper is a physical change- F 19. The liter is a measure of volume- T 20. The amount of heat and temperature of a
  91. chemistry

    Sketch one face of a simple cubic unit cell of side a for the case when the maximum fraction of the lattice in volume is filled with atoms, and each atom is approximated by a hard sphere. (ii) What is the radius of each atom in terms of a? (iii) What is
  92. engineering

    Sketch one face of a simple cubic unit cell of side a for the case when the maximum fraction of the lattice in volume is filled with atoms, and each atom is approximated by a hard sphere. (ii) What is the radius of each atom in terms of a? (iii) What is
  93. calculus

    can someone check these for me: 18. All edges of a cube are expanding at a rate of 6 cm per second. How fast is the volume changing when each edge is a) 2 cm and b) 10 cm. a)72 cm^3/sec b)1800 cm^3/sec 20. The formula for the volume of a cone is
  94. Chemistry

    Is dissolving salt in water an example of reversible? I don't think so because once salt is in water, the water is not clear anymore. Pls help. thanks. Yes, it is reversible. One ca physically separate the salt and water (evaporation) What do you mean by
  95. CHEMISTRY

    A sample of gas in a balloon has an initial temperature of 28 and a volume of 1360 . If the temperature changes to 86, and there is no change of pressure or amount of gas, what is the new volume, , of the gas? Express the volume numerically in liters.
  96. Chemistry

    I am given that volume of an unknown acid is 25 mL, volume of NaOH is 13 mL and concentration of NaOH is 1.0 M. I have a graph of a titration curve where the equivalence point is pH=9 (pH on y axis and volume of NaOH on x axis) How would i find the pKa
  97. Math

    A builder wants to construct a cube-shaped diving pool with a water volume of 1800 cubic feet. . Approximate the edge length of the pool to the nearest foot
  98. chemistry

    A 8.60-g sample of solid CaSO4·2H2O was heated such that the water turned to steam and was driven off. Assuming ideal behavior, what volume would that steam occupy at 1.00 atm and 100.0 °C?
  99. physics

    A bottle with a volume of 190 U. S. fluid gallons is filled at the rate of 1.8 g/min. (Water has a density of 1000 kg/m3, and 1 U.S. fluid gallon = 231 in.3.) In years, how long does the filling take?
  100. physics

    A bottle with a volume of 180 U. S. fluid gallons is filled at the rate of 1.6 g/min. (Water has a density of 1000 kg/m^3, and 1 U.S. fluid gallon = 231 in.^3.) In years, how long does the filling take?